I'm running an open plenum Weiand, with an open spacer and looking to do one of the next mentioned.

*Holley makes a plenum divider that is just a plate that splits the plenum. The top of the plate has 2 tabs that go in slots on the spacer. Looks very easy to make.
*Summit also has 4 hole spacer made of phenolic that has a spiral bore.

Anyone use either of these?
I'm looking for more torque and looking to get rid of that mid-range flutter spot.

On 2004-10-26 00:57, mattri wrote:
What are the advantages of the two types of carb spacer, the open plenum versus the ones with the 4 holes? Is one designed to help in the low end?

It all depends on the application. A large engine with a small carburetor will benefit from both spacers just the same where as the four hole can help a large carburetor on a small engine. It can get real technical with respect to pulse tuning and intake wavelengths.

Take the engine out...........have it dyno'd. USE each and every spacer that you'd like to use. (most dyno shops have these readily available to try).
Then choose from there.
THEN take it to the track, and do your own test/ntuning and see what REAL world apps do for you.
My .002

EVERY engine/car/setup likes/does something different. Kind of like everything else. No 2 peoples vehicle react the same way to the same mod. Just the way it is.
There are basic thoughts/theories, but until YOU do it to YOUR vehicle, you never know.

EVERY engine/car/setup likes/does something different. Kind of like everything else. No 2 peoples vehicle react the same way to the same mod. Just the way it is.
There are basic thoughts/theories, but until YOU do it to YOUR vehicle, you never know.

and you hit the nail right on the head, but for bench racing's sake this guys set-up should show gains with a riser of at least 1". How much and where in the RPM band is to be said, but I will bet a case of beer there are gains in his set-up.

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